13123112212321 has 4 divisors (see below), whose sum is σ = 13226443804672. Its totient is φ = 13019780619972.

The previous prime is 13123112212313. The next prime is 13123112212333. The reversal of 13123112212321 is 12321221132131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13123112212321 - 2³ = 13123112212313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13123112242321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51665795985 + ... + 51665796238.

It is an arithmetic number, because the mean of its divisors is an integer number (3306610951168).

Almost surely, 2^{13123112212321} is an apocalyptic number.

It is an amenable number.

13123112212321 is a deficient number, since it is larger than the sum of its proper divisors (103331592351).

13123112212321 is a wasteful number, since it uses less digits than its factorization.

13123112212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103331592350.

The product of its digits is 864, while the sum is 25.

Adding to 13123112212321 its reverse (12321221132131), we get a palindrome (25444333344452).

The spelling of 13123112212321 in words is "thirteen trillion, one hundred twenty-three billion, one hundred twelve million, two hundred twelve thousand, three hundred twenty-one".